<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>
<body>
    <div id="app">
        姓名：{{ fullName }}
    </div>
    <script src="https://unpkg.com/vue/dist/vue.min.js"></script>
    <script>
        var app = new Vue({
            el:'#app',
            data:{
                firstName:'Jack',
                lastName:'Green'
            },
            computed:{
                fullName:{
                    get:function(){
                        return this.firstName + ' ' + this.lastName;
                    },
                    set:function(newValue){
                        var names = newValue.split(' ');
                        this.firstName = names[0];
                        this.lastName = names[names.length - 1];
                    }
                }
            }
        });
    </script>
</body>
</html>